Armature for dynamo-electric machines



(No Model.) 2 Sheets-Sheet 1.

W. P. FREEMAN.

ARMATURB FOR DYNAMO ELEOTRIG MACHINES. No. 270,781. Patented Jan.16,1883.

FIG J WITNESSES INVENTOR N. Prrcns. Hwwumo m hcr. Wnhingian. D. c.

(No Model.) ZSheets-Sheet :2.

W. P. FREEMAN.

ARMATURE FOR DYNAMO ELECTRIC MACHINES. No. 270,781. Patented Jan. 16,1883.

W..:TNE65E5" ZM ENT'OR; g WW. WW

PATENT OFFICE.

WARREN P. FREEMAN, OF NEW YORK, N. Y., ASSIGNOR TO WILLIAM F. JOBBINS, OF EAST ORANGE, NEW JERSEY.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 270,781, dated January 16, 1883.

Application filed October id, 1882. (No model.)

To all whom it may concern Be it known that I, WARREN P. FREEMAN, a citizen of the United States, and a resident of New York city, New York, have invented certain Improvements in Armatures for Dynamo-Electric Machines or Electric Motors, of which the following is a specification.

My invention consists of improvements in the construction of the armatures of dynamo.

electric machines or electric motors, as fully described hereinafter.

In the accompanying drawings, Figure 1 is a transverse section of my improved armature; Fig. 2, a longitudinal section of the armature without its inducing-coils, and showing an outside view of the commutator; Fig. 3, a sec-- being shown in the drawings four pairs of tubes for each pair of pole-pieces P P and P P, the pairs of tubes being set apart, so that a pair of tubes of one setot' pole-pieces, P P, will pass atright angles between two adjacent pairs of tubes connecting the other two pole-pieces, P P, the tubes of one pair of pole-pieces being out of contact with those of the other pole-pieces. The ends of the tubesT T are set into shallow sockets in the pole-pieces, and all are securely held in place by bolts B pass ing through the pole-pieces and screwed into the brass drum D, the heads of the bolts being let into recesses in the faces of the pole pieces so as not to project beyond the latter. To each end of the drum'is secured a head, I), carrying a journal, A, these journals being adapted tobearingsin which the armature, when complete, may rotate between the poles of the field-magnets. I prefer to make the drum hollow, and at one or both ends of the same are formed air-inlets d, and the tubes T, within the interior of the drum, are provided with perforations t it, while in the pole-pieces P P are formed openings 1) 12, Fig. 1, coinciding with the ends of the tubes '1. so that when I the armature revolves it will act like a fan, and there will be a constant current of air through the armature, as indicated by the arrows in the drawings. The tubes T, with the bolts B, form the cores of the armature, on which are wound the inducing-coils, as indicated in Fig. I l, the terminals of these inducing-coils being connected to the segments of the commutator C, Fig. 2, keyed to one of the journals A, Fig. 4. The body of the commutator is formed of a disk, E, of insulating material and .having an annular recess or groove in its outer face, and in this groove are fitted the flanges f of metal segments F, (four in the present iiistance,) suitably spaced and secured by screws 0, some of which also secure the terminal wires and form the proper electrical connections. The projecting portions of the segments F, Fig. 3, form a ring, as shown in Fig. 4, on which the commutator-brushes bear.

I claim as my invention 1. The combination of a drum and the polepieces of an armature with connecting-tubes forming the core, substantially as set forth.

and pole-pieces of an armature with connecting-tubes forming the core, substantially as described.

3. The combination of a non-magneticdrum and pole-pieces, with tubes passing through said drum and connecting the opposite polepieces, and bolts securing the parts together.

4. The combination of a non-magneticdrum, four or more pole-pieces, and tubes passing through the drum and connecting opposite pole-pieces, the tubes of one pair of poles being out of contact with the tubes of the other pair, substantially as set forth.

5. The combination of a hollow drum with polepieces and connectingtubes passing through said drum, the tubes being perforated within the drum, and the pole-pieces having openings coinciding with the ends of the tubes.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

\VARREN P. FEE E M AN.

Witnesses: 4

(E0. W. OLLIFF, WALTER K. FREEMAN.

2. The combination of a non-magnetic drum 

